[llvm-bugs] [Bug 48623] New: mips stdatomic.h usage includes gcc headers (and fails)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48623

            Bug ID: 48623
           Summary: mips stdatomic.h usage includes gcc headers (and
                    fails)
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: saurik at saurik.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

There have been a number of issues filed that are similar to this over the
years, notably including #22740. This issue was considered fixed a long time
ago, and in fact I generally can't replicate it... except when compiling for
MIPS (which I'm doing using a sysroot based on Debian Stretch).


#include <stdatomic.h>
static inline void CRYPTO_UP_REF(_Atomic int *val, int *ret, void *lock) {
    *ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1; }


/usr/local/opt/llvm/bin/clang --sysroot
/Users/saurik/orchid/cli-shared/out-wrt/sysroot -target mips-linux-gnu -c -o
test.o test.c -v


clang -cc1 version 11.0.0 based upon LLVM 11.0.0 default target
x86_64-apple-darwin18.7.0
ignoring nonexistent directory
"/Users/saurik/orchid/cli-shared/out-wrt/sysroot/usr/local/include"
ignoring nonexistent directory
"/Users/saurik/orchid/cli-shared/out-wrt/sysroot/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/Cellar/llvm/11.0.0/lib/clang/11.0.0/include

/Users/saurik/orchid/cli-shared/out-wrt/sysroot/usr/lib/gcc/mips-linux-gnu/6/include
 /Users/saurik/orchid/cli-shared/out-wrt/sysroot/usr/include/mips-linux-gnu
 /Users/saurik/orchid/cli-shared/out-wrt/sysroot/usr/include
End of search list.


test.c:3:12: error: address argument to atomic operation must be a pointer to
integer or pointer ('_Atomic(int) *' invalid)
    *ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1; }
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/saurik/orchid/cli-shared/out-wrt/sysroot/usr/lib/gcc/mips-linux-gnu/6/include/stdatomic.h:195:6:
note: expanded from macro 'atomic_fetch_add_explicit'
                          __atomic_fetch_add ((PTR), (VAL), (MO))
                          ^                   ~~~~~
1 error generated.

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